CN116499879B - Underground engineering surrounding rock energy test and rock burst energy absorption control method - Google Patents
Underground engineering surrounding rock energy test and rock burst energy absorption control method Download PDFInfo
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Abstract
The invention discloses an energy testing and rock burst energy absorption control method for surrounding rock of underground engineering, which relates to the technical field of underground engineering safety and comprises the following steps: acquiring parameters while drilling in the process of drilling surrounding rock of a roadway, and obtaining the rock burst energy of the surrounding rock of a unit volume by combining a rock burst energy test model; acquiring performance parameters of the support member, and determining yield load and energy absorption of the support member; obtaining strength design support parameters according to the weight of surrounding rock and the yield load of the support member; obtaining energy design support parameters according to the rock burst energy and the energy absorption capacity of the support member; and combining the surrounding rock strength design support parameters and the energy design support parameters to determine the surrounding rock support design scheme. On the basis of the traditional strength support design, the influence of energy release on the support design is considered, and a surrounding rock explosion energy absorption control support design method based on strength-energy comprehensive criteria is established; the risk of occurrence of coal mine dynamic disasters can be reduced, and the construction safety is ensured.
Description
Technical Field
The invention relates to the technical field of underground engineering safety, in particular to an energy testing and rock burst energy absorption control method for surrounding rock of underground engineering.
Background
Along with the increasing of underground engineering burial depths of mines, hydropower, traffic and the like, surrounding rock dynamic disaster problems represented by rock burst, rock burst and the like are in an ascending trend. The dynamic disaster of the surrounding rock of the coal mine is a destructive and huge engineering problem, has burst property, acutely property and randomly property, and brings great threat to the personal safety of operators. Controlling the occurrence of dynamic disasters of surrounding rocks in deep mining of coal mines has become a problem to be solved urgently at present.
The prior art discloses a design method for high prestress energy absorption control of coal mine dynamic disasters, which comprises the following steps: acquiring drilling parameters and performance parameters of a target supporting member in the process of drilling surrounding rock of a roadway; determining surrounding rock accumulated energy corresponding to the unit length of a roadway according to the while-drilling parameters; determining a minimum energy absorption of the target support member according to the performance parameter; and determining design parameters of the target supporting member in the unit length of the roadway according to the surrounding rock accumulated energy corresponding to the unit length of the roadway, the minimum energy absorption amount of the target supporting member, the energy absorption amount of other supporting members in the unit length of the roadway stored in advance, the preset safety coefficient, the preset critical energy for occurrence of dynamic disasters and the preset supporting length of the section of the roadway. The surrounding rock energy accumulation in the scheme is self stored energy in the surrounding rock under a static condition, but after the surrounding rock is disturbed by excavation, the initial three-dimensional stress state is broken, so that the stress of the surrounding rock is redistributed. The stress state of the rock mass is converted from a stable three-dimensional stress state to a two-dimensional or near-one-dimensional stress state. In the stress state conversion process, rock burst is easy to occur; the influence of stress change caused by excavation unloading on surrounding rock energy is not considered in the prior art, so that energy absorption control cannot meet the requirement.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an underground engineering surrounding rock energy testing and rock burst energy absorption control method, and establishes a surrounding rock burst energy absorption control support design method based on strength-energy comprehensive criteria by considering the influence of energy release on support design on the basis of traditional strength support design; the risk of occurrence of coal mine dynamic disasters can be reduced, and the construction safety is ensured.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the embodiment of the invention provides an underground engineering surrounding rock energy testing and rock burst energy absorbing control method, which comprises the following steps:
acquiring parameters while drilling in the process of drilling surrounding rock of a roadway, and obtaining the rock burst energy of the surrounding rock of a unit volume by combining a rock burst energy test model;
acquiring performance parameters of the support member, and determining yield load and energy absorption of the support member;
obtaining strength design support parameters according to the weight of surrounding rock and the yield load of the support member; obtaining energy design support parameters according to the rock burst energy and the energy absorption capacity of the support member;
and combining the surrounding rock strength design support parameters and the energy design support parameters to control the surrounding rock support design scheme.
As a further implementation, the while-drilling parameters include drilling rate, bit rotational speed, drilling torque, and drilling pressure; the performance parameters of the support member include yield load, breaking load, and elongation.
As a further implementation manner, the rock burst energy determination method of the surrounding rock in unit volume comprises the following steps:
substituting the parameter while drilling into a rock burst energy test model to determine the field surrounding rock energy in a three-dimensional stress stateE 1 ；
Developing an indoor compression test to obtain the energy required by rock uniaxial compression fractureE 2 ；
Will beE 1 AndE 2 making difference to obtain the surrounding rock explosion energy deltaE s 。
As a further implementation, the surrounding rock energy is obtained by using the equivalent compressive strength of the rock mass and the rock peak strain, or the surrounding rock energy is obtained by using the equivalent compressive strength of the rock mass and the equivalent elastic modulus of the rock mass.
As a further implementation form of this,；
or ,；
wherein ,E 1 representing the energy of the surrounding rock in the field,σ eq representing the equivalent compressive strength epsilon of the rock mass in the field three-dimensional stress state c Representing peak strain of the rock uniaxial compression test;E eq and the equivalent elastic modulus of the rock mass in the on-site three-dimensional stress state is shown.
As a further implementation manner, the relationship between the strength design support parameter and the surrounding rock weight and yield load is:
；
wherein ,N s representing the number of support members designed based on strength;F p representing the pretightening force of the support member;k s representing the strength support coefficient;γ i representing the volume weight of the formation;h i representing the formation thickness;βrepresenting the dip angle of the formation;nindicating the number of formations within the support.
As a further implementation, the pretension of the support memberF p Is a yield loadF y And the product of the pre-tightening force application coefficient alpha.
As a further implementation manner, the relation between the energy design support parameter and the rock burst energy and the energy absorption amount is as follows:
wherein ,N e representing the number of support members designed based on energy;E b representing the maximum absorbable energy of the support member;k e representing the energy absorption coefficient;V sr representing the volume of surrounding rock in the supporting range; go (L)E s Representing the field surrounding rock burst energy.
As a further implementation, after the surrounding rock support is completed, a monitoring element is installed to monitor the stability of the surrounding rock.
As a further implementation mode, the characteristics of the bolt shaft force, the surrounding rock deformation and the rock mass breaking microseismic energy in the construction area are collected through a monitoring element, so that the surrounding rock control effect is evaluated, and an evaluation result is obtained; and optimizing the support parameters according to the evaluation result.
The beneficial effects of the invention are as follows:
according to the invention, the rock burst energy of the surrounding rock in unit volume is determined by substituting the monitored while-drilling parameters into the rock burst energy test model; determining the yield load and the energy absorption capacity of the support member according to the performance parameters of the support member; determining strength design support parameters according to the weight of surrounding rock and the yield load of the support member; determining energy design support parameters according to the rock burst energy and the energy absorption capacity of the support member; designing supporting parameters and energy according to the strength of surrounding rock, and comprehensively determining the combination mode and the design parameters of surrounding rock supporting; the risk of rock burst occurrence can be reduced, and the construction safety is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flow diagram in accordance with one or more embodiments of the invention;
FIG. 2 is a schematic representation of a rock burst energy calculation model in accordance with one or more embodiments of the present invention.
Detailed Description
Embodiment one:
the embodiment provides a method for testing energy of surrounding rock and controlling rock burst energy absorption of underground engineering, as shown in fig. 1, comprising the following steps: acquiring parameters while drilling in the process of drilling surrounding rock of a roadway, and obtaining the rock burst energy of the surrounding rock of a unit volume by combining a rock burst energy test model; acquiring performance parameters of the support member, and determining yield load and energy absorption of the support member; obtaining strength design support parameters according to the weight of surrounding rock and the yield load of the support member; obtaining energy design support parameters according to the rock burst energy and the energy absorption capacity of the support member; and combining the surrounding rock strength design support parameters and the energy design support parameters to control the surrounding rock support design scheme, wherein the surrounding rock support design scheme comprises a combination mode and design parameters of surrounding rock support.
Specifically, the method for determining the rock burst energy of the surrounding rock in unit volume comprises the following steps:
substituting the while-drilling parameters into a rock energy while-drilling test model to determine the on-site surrounding rock energy under the three-dimensional stress stateE 1 The method comprises the steps of carrying out a first treatment on the surface of the The drilling parameters comprise drilling speed, drill bit rotating speed, drilling torque and drilling pressure;
developing an indoor compression test to obtain the energy required by rock uniaxial compression fractureE 2 ；
Will beE 1 AndE 2 performing difference to obtain the surrounding rock explosion energy deltaE s 。
Two methods exist for determining the energy of the surrounding rock in the field under the three-dimensional stress state:
the first method is as follows: and obtaining surrounding rock energy by using the rock equivalent compressive strength and rock peak strain:
；
wherein ,E 1 representing the energy of the surrounding rock in the field,σ eq is equivalent compressive strength epsilon of rock mass in field three-dimensional stress state c Is the peak strain of the rock uniaxial compression test.
The second method is as follows: the surrounding rock energy is obtained by using the rock mass equivalent compressive strength and the rock mass equivalent elastic modulus:
；
wherein ,E 1 representing the energy of the surrounding rock in the field,σ eq for the equivalent compressive strength of the rock mass in the on-site three-dimensional stress state,E eq the equivalent elastic modulus of the rock mass in the on-site three-dimensional stress state.
After excavation and unloading of surrounding rocks of deep underground engineering, radial stress is zero, and tangential stress is concentrated. When the energy accumulated by the rock mass is large enough, the accumulated energy can be quickly released, and the rock burst phenomenon is generated. The rock burst energy is the difference between the energy of the surrounding rock on site and the energy required by the uniaxial damage of the rock mass in the three-dimensional stress state, as shown in figure 2; the energy required for the uniaxial damage of the rock mass is the area enclosed by the uniaxial compression curve and the coordinate axis. According to the energy of the field surrounding rock and the energy required by the uniaxial damage of the rock mass in the three-dimensional stress state, the formula for determining the rock burst energy of the field surrounding rock is as follows:
wherein ,∆E s Representing the field surrounding rock explosion energy;E 1 representing the energy of the surrounding rock on site in a three-dimensional stress state;E 2 representing the energy required for uniaxial breaking of the rock mass.
In the embodiment, the while-drilling parameters are obtained by performing in-situ digital drilling test on surrounding rock in the roadway support range through the intelligent drilling machine. The in-situ digital drilling test gets rid of the flow of on-site drilling coring, cataloging, transportation, cutting polishing and indoor test of the traditional test method, and can realize the on-site in-situ test of surrounding rock parameters.
The intelligent drilling machine is existing equipment and comprises a drilling machine main body, a high-precision rotating speed sensor, a high-precision pressure sensor, a high-precision torque sensor and a high-precision displacement sensor, and is used for monitoring the rotating speed, the drilling pressure, the drilling torque and the drilling speed of a drill bit. For example: the intelligent drilling machine for implementing the in-situ digital drilling test of the surrounding rock comprises a drilling machine main body, a high-precision rotating speed sensor, a high-precision pressure sensor, a high-precision torque sensor, a high-precision displacement sensor and other components, can monitor drilling parameters such as the rotating speed of a drill bit, the drilling pressure, the drilling torque, the drilling speed and the like in the drilling process in real time, and uploads monitored drilling data to computer equipment in real time for operation, and acquires the explosion energy of the surrounding rock in situ while drilling in real time.
In this embodiment, the computer device may dynamically adjust the oil intake amount through the hydraulic servo valve according to the while-drilling parameters, and control any one set of while-drilling parameters of the drilling speed and the drill bit rotation speed, the drilling pressure, and the drill bit rotation speed of the intelligent drilling machine to keep constant, so that the intelligent drilling machine drills at a constant drilling speed and a constant drill bit rotation speed, or at a constant drill bit rotation speed and a constant drilling pressure.
The intelligent drilling machine is provided with a special digital analysis drill bit, the digital analysis drill bit consists of a square composite sheet and a solid steel tire body, the square composite sheet is inlaid in the tire body to form a drill bit cutting edge of the digital analysis drill bit, and the square composite sheet is in linear contact with rock in a stress state and is used for mechanically analyzing the rock mass cutting process.
In this embodiment, the material of the target supporting member is an ideal elastoplastic material, and has the characteristics of high prestress, gao Hengzu, high energy absorption and high elongation. Compared with common support materials such as Q345-level steel, the ideal plastic material has higher yield load, no obvious yield platform, enough safety strength storage, high prestress application and full play of the self-bearing capacity of surrounding rock. Ideal plastic materials include NPR (Negative Poisson Ratio ) materials, TWIP (Twinning Induced Plasticity Steel, twinning induced plasticity steel) high strength and high toughness materials, and the like.
The formula of the prestress applied by the support member is:
F p =αF y
wherein ,F p representing the pretightening force of the support member;F y representing the yield load of the support member; alpha is a pretightening force application coefficient and is generally 60% -90%.
The relation between the strength design support parameters, the weight of surrounding rock and the yield load of the support member is as follows:
wherein ,N s representing the number of support members designed based on strength;F p representing the pretightening force of the support member;k s representing the strength support coefficient;γ i representing the volume weight of the formation;h i representation ofFormation thickness;βrepresenting the dip angle of the formation;nindicating the number of formations within the support.
The relation between the energy design support parameter and the rock burst energy and the energy absorption of the support member is as follows:
wherein ,N e representing the number of support members designed based on energy;E b representing the maximum absorbable energy of the support member;k e representing the energy absorption coefficient;V sr representing the volume of surrounding rock in the supporting range; go (L)E s Representing the field surrounding rock burst energy.
In this embodiment, the support member performance parameters include a yield load of the support member, a first extension amount corresponding to the yield load of the support member, a prestress application design value of the support member, a second extension amount corresponding to the prestress application design value of the support member, and a third extension amount corresponding to the breaking strength of the target support member.
The formula of the energy absorption amount of the support member is:
E b =（F y +F p ）（D y -D p ）/2 +（F max +F y ）（D max -D y ）/2
wherein ,E b indicating the amount of the first energy absorption,F y indicating the yield load of the product,F max the broken load is indicated by the expression,D y the first amount of extension is indicated and,D p the second amount of extension is indicated and,D max the third extension amount is indicated as such,F p indicating the design value of the pre-stress application,F p =αF y ，αrepresenting the corresponding pre-stress application coefficient of the support member.
After the design and calculation of the energy absorption of the support member are completed, a power impact test of the support member is carried out, and the energy absorption of the anchor rod is checked. The supporting member comprises an anchor rod and an anchor rope, can support the surrounding rock in a single mode by selecting the anchor rod or the anchor rope, and can also support the surrounding rock in a coupling mode by adopting the anchor rod and the anchor rope.
After the surrounding rock support is completed, a monitoring element is installed to monitor the stability of the surrounding rock, and the monitoring element comprises a bolt shaft force meter, a surrounding rock displacement meter and a microseismic monitoring sensor. The monitoring method comprises the following steps:
respectively acquiring the axial force of the anchor rod, the deformation of surrounding rock and the micro-vibration energy characteristics of rock mass breakage in a construction area through a monitoring element;
evaluating the surrounding rock control effect according to the anchor rod axial force, the surrounding rock deformation and the rock mass breaking microseismic energy characteristics to obtain an evaluation result;
and dynamically optimizing the support parameters according to the evaluation result.
According to the method, on the basis of the traditional strength support design, the influence of energy release on the support design is considered, and the surrounding rock explosion energy absorption control support design method based on the strength-energy comprehensive criterion is established, so that the occurrence risk of coal mine dynamic disasters can be reduced, and the construction safety is ensured.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The method for controlling the energy test and the rock burst energy absorption of the surrounding rock of the underground engineering is characterized by comprising the following steps:
acquiring parameters while drilling in the process of drilling surrounding rock of a roadway, and obtaining the rock burst energy of the surrounding rock of a unit volume by combining a rock burst energy test model; the while-drilling parameters comprise drilling speed, drill bit rotating speed, drilling torque and drilling pressure; the performance parameters of the support member include yield load, breaking load, and elongation;
acquiring performance parameters of the support member, and determining yield load and energy absorption of the support member;
obtaining strength design support parameters according to the weight of surrounding rock and the yield load of the support member; obtaining energy design support parameters according to the rock burst energy and the energy absorption capacity of the support member; the relation between the strength design support parameter and the weight and yield load of the surrounding rock is as follows:
；
wherein ,N s representing the number of support members designed based on strength;F p representing the pretightening force of the support member;k s representing the strength support coefficient;γ i representing the volume weight of the formation;h i representing the formation thickness;βrepresenting the dip angle of the formation;nrepresenting the number of strata within the support;
combining the surrounding rock strength design support parameters and the energy design support parameters to determine a surrounding rock support design scheme;
the rock burst energy determination method of the surrounding rock in unit volume comprises the following steps:
substituting the parameter while drilling into a rock burst energy test model to determine the field surrounding rock energy in a three-dimensional stress stateE 1 ；
Developing an indoor compression test to obtain the energy required by rock uniaxial compression fractureE 2 ；
Will beE 1 AndE 2 making difference to obtain the surrounding rock explosion energy deltaE s I.e. a rock burst energy test model.
2. The method for testing and controlling the energy absorption of rock burst in underground engineering surrounding rock according to claim 1, wherein the surrounding rock energy is obtained by using the equivalent compressive strength of the rock mass and the peak strain of the rock, or the surrounding rock energy is obtained by using the equivalent compressive strength of the rock mass and the equivalent elastic modulus of the rock mass.
3. The method for controlling energy testing and rock burst energy absorption of underground engineering surrounding rock according to claim 1, wherein,；
or ,；
wherein ,E1 Representing the energy of surrounding rock in site, sigma eq Representing the equivalent compressive strength epsilon of the rock mass in the field three-dimensional stress state c Representing peak strain of the rock uniaxial compression test; e (E) eq And the equivalent elastic modulus of the rock mass in the on-site three-dimensional stress state is shown.
4. The method for controlling energy testing and rock burst energy absorption of underground engineering surrounding rock according to claim 1, wherein the pre-tightening force F of the supporting member p Is given by yield load F y And the product of the pre-tightening force application coefficient alpha.
5. The method for controlling energy testing and rock burst energy absorption of underground engineering surrounding rock according to claim 1, wherein the relation between the energy design support parameter and the rock burst energy and the energy absorption is:
wherein ,Ne Representing the number of support members designed based on energy; e (E) b Representing the maximum absorbable energy of the support member; k (k) e Representing the energy absorption coefficient; v (V) sr Representing the volume of surrounding rock in the supporting range; and E is equal to s Representing the field surrounding rock burst energy.
6. The method for controlling energy testing and rock burst energy absorption of underground engineering surrounding rock according to claim 1, wherein after the surrounding rock is supported, a monitoring element is installed to monitor the stability of the surrounding rock.
7. The method for testing and controlling the energy absorption of rock burst in underground engineering surrounding rock according to claim 6, wherein the characteristics of the rock burst and the rock deformation and the rock burst microseismic energy in the construction area are collected through a monitoring element so as to evaluate the control effect of the surrounding rock and obtain an evaluation result; and optimizing the support parameters according to the evaluation result.
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| CN106523003A (en) * | 2016-09-27 | 2017-03-22 | 北京科技大学 | Rigid-flexible coupling energy absorbing support technology suitable for deep mining roadway |
| WO2022252399A1 (en) * | 2021-06-04 | 2022-12-08 | 中铁隧道局集团有限公司 | Tunnel field de-reconstruction theory-based method and system for supporting tunnel surrounding rock |
| CN113803083A (en) * | 2021-08-10 | 2021-12-17 | 王�琦 | Underground engineering surrounding rock strength-energy support design method |
| CN114372376A (en) * | 2022-01-14 | 2022-04-19 | 西南石油大学 | Rock burst forecasting method capable of releasing elastic strain energy based on tunnel surrounding rock support |
| CN114483024A (en) * | 2022-04-18 | 2022-05-13 | 中国矿业大学(北京) | Rock burst grade in-situ evaluation and control design method |
| CN114547810A (en) * | 2022-04-25 | 2022-05-27 | 中国矿业大学(北京) | High-prestress energy absorption control design method for coal mine dynamic disaster |
| CN115577567A (en) * | 2022-11-15 | 2023-01-06 | 中国矿业大学(北京) | Deep underground engineering rock burst prevention and control method and system |
| CN115618526A (en) * | 2022-11-15 | 2023-01-17 | 中国矿业大学(北京) | Rock burst energy in-situ test and evaluation method |
| CN116205089A (en) * | 2023-05-05 | 2023-06-02 | 中国矿业大学(北京) | Rock burst control and design method |
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